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 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
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   <dt id="constant.force-gzip">
    <strong><code>FORCE_GZIP</code></strong> 
    (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
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   <dt id="constant.force-deflate">
    <strong><code>FORCE_DEFLATE</code></strong> 
    (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
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